Water in hydraulic fluid

as far as i know, the only way to remedy that issue is to drain/replace....however, if you can operate the hydraulics and heat the oil up, in theory, the water should evaporate out of it if you get the oil over 200 degrees, however, this could leave your cases filled with steam, which will just condense back into the oil...so...

Heating the fluid to 140° will help it settle out so that it can be drained off. It will also tend to evapourate at a faster rate than when cold and the fluctuating level from normal hydraulic cylinder operation will vent the excess humidity.

Unfortunately, draining the settled water means opening the drain port which will dump the fluid as well if you aren't quick enough getting the plug back in. It's less messy to just drain and change the fluid and bite the bullet for the cost since it takes quite a bit of time at temperature to separate and settle the water out.

If it regularly gets normal use that warms the fluid up to 140°+, the water will <eventually> evapourate. If it sits for long periods of time between uses, change the fluid to get rid of the water.

Drain it. Water is a **** poor lubricant and a great oxidizer for rust. Then find out where it came from if its not already to late